Just need to know a few things: (1) Will I lose anything/everything I have saved on my HD like when you upgrade from XP to Vista? (2) Do all of the core programs work (i.e. iChat, MS office, iTunes) with this system? (3) Any problems with getting hardware to setup? I just got my MBP and what to make sure that I'm not going to run into driver issues when I install this. Thanks for the help, and excuse some of the more seemly elementary questions.